Influence of Wind-Break Wall on Aerodynamic Performance of EMU Train under Crosswind

Abstract

EMU train and simply supported bridge of 32 m high-speed railway were chosen to study the effect of wind-break wall on aerodynamic characteristics of vehiclebridge system under cross-wind. The numerical simulation was carried out based on three-dimensional steady N-S equation and k ï€­ï· SST turbulent model. The analysis of aerodynamic characteristics of vehicle-bridge system was taken under equivalent ventilation ratio of wind-break wall, ventilation ratio, eight of wind-break wall and wind deflection angle. The results show that: The increase of wind-break wall’s height will raise side force coefficient and moment coefficient, and show less obvious effect on lift coefficient. Wind-break wall with more railings has better windproof effect than those with less ones which share equivalent ventilation ratio． Higher wind-break wall is not always better and it means that there is a reasonable height range. Increasing ventilation ratio will raise aerodynamic coefficients of vehicle with the same wind-break wall’s height．